Abstract
Developments in the design of the vacuum system for the proposed gravitational wave detector, GEO, are described, together with some small scale tests. The vacuum chamber will consist of two horizontal stainless steel tubes, 1.4 m diameter and 3 km long, arranged in an L, connecting a number of experimental tank stations. By heating the tubes to 200°C in air, followed by a vacuum bake at 150°C, an outgassing rate of ∼ 10−13 mbar l s−1 cm−2 will be achieved. Turbomolecular and non-evaporable getter pumps have been chosen to minimise pressure fluctuations and provide a hydrocarbon-free vacuum of ≤10−8 mbar.
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